Precipitation Summary
Station: 111627 CHILLICOTHE, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prec. (in) | 1.58 | 1.65 | 2.80 | 3.34 | 4.24 | 3.99 | 3.67 | 3.60 | 3.36 | 2.66 | 3.10 | 2.37 | 36.36 |
Precipitation Extremes
Period of Record: 1940-2006
| Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
|---|---|---|---|---|---|---|
| Jan | 6.54 | 1965 | 0.12 | 1981 | 4.50 | 01-27-1996 |
| Feb | 6.46 | 1997 | 0.00 | 1987 | 3.86 | 02-21-1997 |
| Mar | 6.90 | 1985 | 0.24 | 2005 | 3.16 | 03-15-1944 |
| Apr | 7.67 | 1981 | 0.65 | 1986 | 2.56 | 04-20-1955 |
| May | 10.81 | 1995 | 0.60 | 1992 | 2.66 | 05-12-2002 |
| Jun | 10.91 | 1990 | 0.40 | 1965 | 4.06 | 06-20-1964 |
| Jul | 9.09 | 1992 | 0.26 | 1988 | 4.49 | 07-09-1951 |
| Aug | 10.00 | 1987 | 0.49 | 1974 | 4.80 | 08-17-1997 |
| Sep | 11.24 | 1961 | 0.00 | 1979 | 3.13 | 09-14-1961 |
| Oct | 9.75 | 1941 | 0.01 | 1964 | 4.02 | 10-03-1986 |
| Nov | 10.22 | 1985 | 0.25 | 1999 | 3.11 | 11-19-1985 |
| Dec | 5.77 | 1982 | 0.24 | 1958 | 2.77 | 12-03-1982 |
| Annual | 54.56 | 1970 | 21.83 | 2005 | 4.80 | 08-17-1997 |
| Winter | 11.98 | 1950 | 1.47 | 1963 | 4.50 | 01-27-1996 |
| Spring | 17.97 | 1995 | 3.70 | 1992 | 3.16 | 03-15-1944 |
| Summer | 23.08 | 1981 | 3.20 | 1988 | 4.80 | 08-17-1997 |
| Fall | 16.98 | 1961 | 3.14 | 2002 | 4.02 | 10-03-1986 |
Precipitation Threshold Climatology
Derived from 1971-2000 Averages:
*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding.
| Month | # Days Total ≥ 0.01″ |
# Days Total ≥ 0.10″ |
# Days Total ≥ 0.50″ |
# Days Total ≥ 1.00″ |
|---|---|---|---|---|
| Jan | 6.5 | 4.6 | 0.8 | 0.2 |
| Feb | 5.6 | 3.9 | 1.0 | 0.2 |
| Mar | 8.1 | 5.9 | 1.8 | 0.6 |
| Apr | 8.9 | 6.5 | 2.1 | 0.9 |
| May | 10.2 | 7.8 | 3.0 | 1.0 |
| Jun | 8.9 | 6.4 | 2.8 | 1.0 |
| Jul | 7.7 | 6.0 | 2.5 | 1.1 |
| Aug | 8.1 | 6.2 | 2.4 | 1.0 |
| Sep | 6.8 | 5.0 | 2.2 | 0.9 |
| Oct | 7.0 | 5.1 | 1.7 | 0.6 |
| Nov | 7.6 | 5.8 | 2.3 | 0.8 |
| Dec | 7.2 | 5.1 | 1.3 | 0.6 |
| Annual | 92.5 | 68.3 | 24.0 | 8.8 |
| Winter | 19.2 | 13.6 | 3.1 | 1.0 |
| Spring | 27.2 | 20.2 | 6.9 | 2.5 |
| Summer | 24.8 | 18.5 | 7.8 | 3.1 |
| Fall | 21.4 | 16.0 | 6.2 | 2.3 |
Temperature Summary
There are insufficient temperature data to produce the temperature summary.
Snowfall Summary
Station: 111627 CHILLICOTHE, IL
1971-2000 Averages
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow (in) | 7.1 | 4.3 | 2.1 | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.9 | 5.7 | 21.0 |
Snowfall Extremes
Period of Record: 1940-2006
| Month | High (in) | Year | 1-Day Max (in) | Date |
|---|---|---|---|---|
| Jan | 27.0 | 1979 | 11.0 | 01-27-1967 |
| Feb | 14.0 | 1950 | 5.3 | 02-14-1952 |
| Mar | 12.1 | 1965 | 7.5 | 03-09-1999 |
| Apr | 11.5 | 1997 | 11.5 | 04-11-1997 |
| May | 0.0 | – | – | – |
| Jun | 0.0 | – | – | – |
| Jul | 0.0 | – | – | – |
| Aug | 0.0 | – | – | – |
| Sep | 0.0 | – | – | – |
| Oct | 2.0 | 1967 | 2.0 | 10-27-1967 |
| Nov | 6.2 | 1951 | 5.0 | 11-27-1975 |
| Dec | 18.1 | 2000 | 9.0 | 12-19-1973 |
| Season (Jul-Jun) | 40.2 | 1951-1952 | 11.5 | 04-11-1997 |
Snowfall Threshold Climatology
Derived from 1971-2000 Averages
*Annual values may differ from the sum of the monthly values due to rounding.
| Month | # Days Total ≥ 0.1″ |
# Days Total ≥ 1.0″ |
# Days Total ≥ 2.0″ |
# Days Total ≥ 5.0″ |
|---|---|---|---|---|
| Jan | 2.6 | 2.1 | 1.0 | 0.1 |
| Feb | 2.6 | 2.1 | 1.0 | 0.1 |
| Mar | 0.9 | 0.8 | 0.4 | 0.1 |
| Apr | 0.2 | 0.2 | 0.2 | 0.0 |
| May | 0.0 | 0.0 | 0.0 | 0.0 |
| Jun | 0.0 | 0.0 | 0.0 | 0.0 |
| Jul | 0.0 | 0.0 | 0.0 | 0.0 |
| Aug | 0.0 | 0.0 | 0.0 | 0.0 |
| Sep | 0.0 | 0.0 | 0.0 | 0.0 |
| Oct | 0.0 | 0.0 | 0.0 | 0.0 |
| Nov | 0.7 | 0.5 | 0.2 | 0.0 |
| Dec | 2.9 | 2.4 | 1.4 | 0.1 |
| Annual | 11.2 | 9.1 | 4.6 | 0.7 |
Growing Season Summary
There are insufficient temperature data to produce the growing season summary.
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007